Binary Outputs (Output Contacts); Figure 2.8-1 Binary Input Logic - Siemens 7SR18 Solkor Manual

7SR18 Description Of Operation

Figure 2.8-1 Binary Input Logic

2.9

Binary Outputs (Output Contacts)

Relays are fitted with 5 binary output (BO) contacts or 8 binary output contacts depending upon variant. All
outputs are fully user configurable and can be programmed to operate from any or all of the available functions.
In the default mode of operation binary outputs are self reset and remain energised for a user configurable
minimum time of up to 60 seconds. If required, outputs can be programmed to operate as 'hand reset' or 'pulsed'.
If the output is programmed to be 'hand reset' and 'pulsed' then the output will be 'hand reset' only.
Operating a binary output as 'hand reset' fulfils the requirements of ANSI function 86 (Lockout).
The binary outputs can be used to operate the trip coils of the circuit breaker directly where the trip coil current
does not exceed the 'make and carry' contact rating. The circuit breaker auxiliary contacts or other in-series
auxiliary device must be used to break the trip coil current.
Any BO can be assigned as a 'Trip Contact' in the OUTPUT CONFIG>TRIP CONFIG menu. Operation of a 'Trip
Contact' will operate any LED or virtual assigned from the 'Trip Triggered' feature in the same menu and will
initiate the fault record storage, actuate the 'Trip Alert' screen where enabled and CB Fail protection when
enabled.
Where a protection function is mapped to an output contact, the output contact can be configured to trigger when
the protection function picks-up rather than when it operates. Such output contacts are configured via the
OUTPUT CONFIG>BINARY OUTPUT CONFIG>Pickup Outputs setting.
Notes on Pulsed Outputs
When operated, the output will reset after a user configurable time of up to 60 seconds regardless of the initiating
condition.
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